Add the Milk Kefir Starter (CFH) packet OR kefir whey to your juice and stir till dissolved.
Fill the rest of the bottle with water leaving an inch of room at the top.
Allow it to ferment for 2-5 days or until bubbly and fizzy. If your home is 75°F or warmer it will take usually 3-4 days. Colder homes can take a week or longer but you'll need to check it by popping the top and see if it's getting fizzy. It will start to bubble out the top if it does.
When it's done, place it in the fridge right away. You can pour in a glass and enjoy right away but keep it stored in the fridge or it will explode. Consume within 1-2 weeks for the best flavor and most benefit.
You can use ⅓ cup of this finished kefir soda as a starter to make a new bottle. Add the other ingredients and ferment again. It should only take a halfto a full day to ferment. It ferments faster and you can make many bottles over and over again!